Multi Select lookup parameter using UI Builder class In Dynamics 365 Finance and Operations using x++

Today we see how to get multi-select lookup in the report dialog.  This is used to sys operation Framework also. We have to fetch selected records in dp class or service class. For this, I wrote logic in the below classes.

Contract Class :

[
    DataContractAttribute,
    SysOperationContractProcessingAttribute(classstr(UIBuilderClass))
]
class ContractClass
{
    List  vendAccountList;
 
    [
        DataMemberAttribute("Vendor"),
        AifCollectionTypeAttribute("Vendor", Types::String),
        SysOperationLabelAttribute(literalstr("Vend account")),
        SysOperationHelpTextAttribute(literalstr("Vend account.")),
        SysOperationDisplayOrderAttribute('1')
    ]
 
    public List parmVendorList(List _vendAccountList = vendAccountList)
    {
        vendAccountList = _vendAccountList;
        return vendAccountList;
    }
}
_________________________________________________________________________________

UI Builder Class:

class UIBuilderClass extends SrsReportDataContractUIBuilder
{
    ContractClass       myContractClass;
    DialogField         dialogField;
    container           con;
    public void build()
    {
         myContractClass = this.dataContractObject() as ContractClass;
         dialogField   = this.addDialogField(methodStr(ContractClass, parmVendorList), ContractClass);
    }
 
    public void postBuild() //or postRun() we can use any method.
    {
        super();
        myContractClass = this.dataContractObject() as ContractClass;
        dialogField     = this.bindInfo().getDialogField(ContractClass,
                                           methodStr(ContractClass, parmVendorList));
        dialogField.registerOverrideMethod(methodStr(FormStringControl, lookup),
                                           methodStr(UIBuilderClass, VendorLookup), this);
        methodStr(UIBuilderClass, Vendormodified), this); // modified method.
    }
 
    public void VendorLookup(FormStringControl _control)
    {
        Query                   query = new Query();
        QueryBuildDataSource    vendQBD;
        vendQBD = query.addDataSource(tableNum(VendTable));
        vendQBD.addSelectionField(fieldNum(VendTable, AccountNum));
        SysLookupMultiSelectGrid::lookup(query,
                                         _control,
                                         _control,
                                         _control,
                                         con);
    }
}
__________________________________________________________________________________

DP Class:

[
    SRSReportQueryAttribute (querystr(Myquery)),
    SRSReportParameterAttribute(classstr(ContractClass))
]
class DPClass extends SRSReportDataProviderBase //SrsReportDataProviderPreProcess
{
    MyTable             myTable;
    List                vendorList;
    Vendtable           vendTable;
 
    [SRSReportDataSetAttribute(tableStr('MyTable'))]
    public MyTable getTempMyTable()
    {
        select MyTable;
        return MyTable;
    }
 
    private Query buildQuery(Query  _query,List _vendorList)
    {
        ListIterator listIterator = new ListIterator(_vendorList);
 
        while(listIterator.more())
        {
            _query.dataSourceTable(tablenum(VendTable)).addRange(fieldnum(VendTable, AccountNum)).value(queryValue(listIterator.value()));
            listIterator.next();
        }
 
        return _query;
    }
 
    public void processReport()
    {
        QueryRun            queryRun;
        TestContractClass   contract = this.parmDataContract() as TestContractClass;
        Query               query    = this.parmQuery();
        ;
 
        vendorList = contract.parmVendorList();
 
        queryRun = new QueryRun(vendorList.empty() ? query : this.buildQuery(this.parmQuery(), vendorList));
 
        while(queryRun.next())
        {
            vendTable = queryRun.get(tablenum(VendTable));
            this.insertIntoTempTable();
        }
    }
 
    private void insertIntoTempTable()
    {
        myTable.AccountNum  = vendTable.AccountNum;
        myTable.VendGroup   = vendTable.VendGroup;
        myTable.insert();
    }
}